DSTE&reg; 2x NP-E3 Replacement Ni-MH Battery for Canon EOS 1D EOS 1D MarkII EOS 1D MarkII N EOS 1DS EOS 1DS MarkII Camera Battery Type : Ni-MH Battery Capacity : 27.6Wh/2300mAh Battery Voltage: 12V Info Function for Life Indication Note:Please do not pull the lock buckle with force to avoid damage, If the lock was broken,you can contact us.